Lenovo ThinkCentre A58 Hardware Maintenance Manual page 114

Figure 20. Tabs on the microprocessor socket cover (bottom view)
Figure 21. Installing the microprocessor socket cover
12. Install the new retention module on the new system board.
13. Install the heat sink and fan assembly and connect the heat sink and fan
14. Install the new system board into the chassis and align the screw holes with
15. Install all memory modules and adapter cards removed from the failing
16. Reinstall the primary hard disk drive with the hard disk drive cage.
17. Reconnect all remaining cables to the system board. See "Locating parts on the
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Hardware Maintenance Manual
To install the microprocessor socket cover:
a. Make sure the microprocessor has been removed from the microprocessor
socket, and then close the microprocessor retainer and lock it into position
with the small handle.
b. Insert the tabs 1 of the socket cover into the hinged side of the socket,
and then press the other side of the socket cover downward until the tabs
2 snap into position.
assembly cable to the microprocessor fan connector on the new system board.
those in the chassis. Insert and tighten the screws to secure the new system
board in place.
system board on the new system board.
system board" on page 90.
What to do next:
v To work with another piece of hardware, go to the appropriate section.
v To complete the replacement, go to "Completing the parts replacement" on
page 118.